[OT]RE: concurrency problem

["Kalra, Ashwani" <as...@capgemini.com>]

hi,
Thanks all for your inputs. I need to ensure that sychronisation is should be happening on Unique object. I also have figured out the problem. I noticed  a second thread was calling another methods of the bean. Which is not synchronised.

Thanks again ..

Regds
Ashwani.

> -----Original Message-----
> From: Jeff_Caswell@bcbstx.com [mailto:Jeff_Caswell@bcbstx.com]
> Sent: Friday, April 08, 2005 8:22 PM
> To: Struts Users Mailing List
> Subject: Re: concurrency problem
>
>
>
>
>
>
> Maybe I'm being dense here but:
>
> If every session contains a reference to the bean, and every thread is
> synchronizing on their own session;
>
> It would seem that there would not be any concurrency control.
>
> I would think that they all need to sync on the same object.
>
> JC
>
>
>                                                              
>                                                          
>                       "Kalra, Ashwani"                       
>                                                          
>                       <ashwani.kalra@cap        To:      
> "Struts (E-mail)" <us...@struts.apache.org>                   
>                       gemini.com>               cc:          
>                                                          
>                                                 Subject: 
> concurrency problem                                          
>                       04/08/2005 06:10                       
>                                                          
>                       AM                                     
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>                       Please respond to                      
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>                       "Struts Users                          
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>
> I am facing concurrency problem in following scenario.
>
>
> All our action classes call same stateful session bean . 
> Each action class
> obtains the reference  from HTTPSession object and calls one
> and only one
> business method.
> To prevent the concurrent access to this instance which
> occurs when user
> immediately presses two links quickly in succession I am using the
> following code block
>
>
>
>
> execute(...)  //execute methods of Action class
> {
> ....
> ....
>
>
> //Obtain the session from  Request.User will always be in session here
> session=request.getSession()
> Synchronised(session)
> {
>     //call ejb's  business method.
> }
>
>
> }
>
>
> However sometimes  more than one thread is able to pass
> through, And I get
> exception from Appserver. As 2 threads are not allowed for statefull
> Session bean.
> Can there be problem in above code. Is it ok to synchronise on session
> object.
>
>
>
>
>
>
>
>
>
> Thanks & Regds
>  Ashwani
>
> Ext: 1860
>
>
>
>
>
>
>
>
>
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